Thermostat or draft-regulator



No. B|2,5|5. Patented Oct. I8, |698. M. CANTWELL C. B. &. E, C. WOOD.THERMOSTAT 0RY DRAFT REGULATOR.

- (Application maf: nu. 22, 1897.) (No Model.) 2 Sheets-Sheet I.

Patented 00L I8, |898.

M. C ANTWELL &. C. B. E. C. WUUD. THEBIUSTAT 0R DRAFT REGULATUR.'

(Alapliention med In. 29, 1897.) lo Model.) 2 Shasta-Shui 2.

wlmi-5555- INVENTURE- maf/K@ TH: mams Penas co., vMoTuLl'l-No..WASHINGTON, D, c.4

UNITEDl STATES PATENT EETCE.

MICHAEL CANTWELL, CLARKE. WOOD, AND EDWARD C. WOOD, OE

BOSTON, MASSACHUSETTS.

THERMOSTAT OR DRAFT-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 612,515, dated October1S, 1898.

Application nea March 22, 1897.

To @ZZ whom t may concern: Y

Beit known that we, MICHAEL CANTWELL, CLARK B. WOOD, and EDWARD C. WOOD,of Boston, in the county of Suffolk and State of` Massachusetts, haveinvented certain new and useful Improvements in Thermostats orDraft-Regulators, of which the following is a description sufficientlyfull, clear, and exact to enable those skilled in the art to which itappertains or with which it is most nearly connected to make and use thesame.

This invention has relation to devices of a thermostatic kind for use inthe regulation of the drafts of furnaces and in other places andconnections where it is desired to control any kind of mechanicaldevices by the thermal conditions of certain other devices.

It is the object of this invention to provide means of the charactermentioned which shall be certain in their operation and efficient in thehighest degree in the accomplishment of the desired result.

To these ends the invention consists of the improvements hereinafterdescribed in detail, and then pointed out with particularity in theappended claims.

Reference is to be had to the annexed drawings, and to the lettersmarkedthereon, forming a part of this specification, the same lettersdesignating the same parts or features, as the case may be, whereverthey occur.

Of the drawings, Figure l is a front view of` our invention as appliedto a pipe of a' hotwater heating apparatus,thou gh the pipe may as wellbe supposed to be any other sort of heat-conduit. Fig. 2 is across-sectional view taken on the line 2 2 of Fig. l. Fig. 3 is across-sectional view taken on the line 3 3 of Fig. l. Fig. 4 is asectional detail view taken on the line 4; 4 of Fig. l. Fig. 5 is asectional view taken on the line 5 5 of Fig. 1.

In the drawings, a designates a hotwater pipe or other heat-conduit.

b and c designate yokes or collars fitting around or embracing the pipea, each yoke being provided with an extension above and below the pipe,with the ends of which extensions there are connected bracing bars orrods cl and e, held at some considerable distance from the pipe a. Theyoke b is clamped Serial No. 628,611. (No model.)

` Securely on the pipe, while the yoke c is loosely arranged thereon, sothat the pipe in expandsaid yoke o without materially affecting itsposition.

f and g are zinc plates or bars, the former arrangedon top of the pipea. and the latter beneath the same. Thezinc bar f at its left end, asviewed in Fig. l of the drawings, abuts against the yoke C and is heldin connection therewith by clips or plates 7L h' or other suitablemeans. At the other end the said zinc bar abuts against the upper end ofayoke-lever i, which embraces the pipe a and is provided on its sideswith knife-edge projections or points j, which rest against the inneredge of the yoke b. The yoke-lever tis supported by means of links 7s,pivotally connected at their upper ends to the yoke l) and in likemanner at their lower ends to the lower end of the lower arm Or arms ofthe said yoke-lever. The lower zinc bar g abuts at one end against theinner side of the yoke-lever, and

at the other'end is connected with the upper end of the upper arm of alever Z, fulcrumed on the lower extension of the yoke c.v Connected withthe lower end of the lower and longer arm of the lever Z- is a rod m,which is connected at its opposite end to the short arm of a lever n,fulcrumed on the lower extension of the yoke b, and in turn a rod o isconnected at one end to the longer arm of the lever n, the other end ofsaid rod being connected, if desired, with a damper-operating lever19,01 it may be with other means that it is the object of the entireinvention to operate upon.

The system of levers described is arranged for the purpose of securing amultiplication of the expansive and conti-active movements of the zincbars f and g, and hence a differ ent arrangement of levers securingsubstantially the same result may be employed in place of vthose shown.l

It will be understood that the zincv bars will contribute theirexpansive movement in the direction of the arrows marked thereon andthat when they contract they will move in the opposite direction, sothat a slight expansion or contraction of the said bars governed bytheir temperature will impart a very considerable movement to the leverp, sufficient to open and close the draft of a furnace and regulate thecheck-draft and damper or other similar or different means.

The operation of the invention Will, it is believed, be entirelyunderstood from the foregoing, so that a detailed description thereofneed not be given.

rlhe invention has been found in practice to operate with the utmostcertainty and efciency and to be quite sensitive to the thermalconditions of the pipe a and its surroundings.

Vhen the invention is used in connection with a hot-Water or steamheating apparatus, it has been ascertained that it acts with the mostsatisfactory results when* placed as near the heat-generating means asmay be found feasible, though the point at which it may be located isnot of the essence of the invention.

Having thus explained the nature of the invention and described a Way ofconstructing and using the same, though Without attempting to set forthall of the forms in which it may be made or all of the modes of its use,it is declared that what is claimed isl. A thermostat or heat-regulatorcomprising in its construction a clamping member l) adapted to besecured to a heat-conduit, a yoke or abutment c connected with and at aported by the member Z2, expansion-bars f and g, one of which connectsone end of the lever i With the yoke or abutment c and the other barbeing connected with the other end 0f said lever t', and a lever orsystem of levers connected with the other end of the last-menM tionedbar, the entire device being formed to permit of the heat-conduitextending between the bars f and g and beyond the levers to which theyare connected, whereby the said bars may be located on opposite sides ofsaid conduit.

2. A thermostat 0r heat-regulator comprising vthe yokes or collars b andc, the former having means for clamping it on a heat-conduit, bracingrods or bars d e connecting the yokes, the yoke-lever t fulcrumedagainst the yoke b, links 7c connecting the lever t with the yoke b, theplate or bar f connecting the yoke c with one end of the lever t', thelever Z fulcrumed on the yoke c, the plate o1' bar g connecting thelever l with the other end of the lever 1l, and means connected with thelever Z for operating a damper.

In testimony whereof We have signed our names to this specication, inthe presence of two subscribing Witnesses, this 19th day of March, A. D.1897.

MICHAEL GANTWELL.

CLARK B. TWOOD. EDXVARD C. XVOOD. W'ituesses:

ARTHUR W. CRossLEv, ANNIE J. BAILEY.

